Adjunct for sewing-machine shuttles



L.\E. WEAVER.

ADJUNCT FOR SEWING MACHINE SHUTTLES.

APPLlCATiON FILED FEB.'28,'1921.

1 ,42 1 ,873, Patented July 4,1922.

INVENT DE ATTBRNEYB Lucius E. WEAVER, or EAST HAMPTON, CONNEC ICUT, ASsIGN03-' T SUMMIT THREAD coiv rn-ivv, or nner HAMPTON, CONNECTICUT, *A. CORPORATION; OF

MAINE. 1,421,873.

T 0 all whom it may concern:

Be it known that I, LUCIUsE. WEAVER,

' arcitizen ofthe United States, residing at East Hampton, in the county of Middlesex and State of Connecticut, have invented new and useful Improvements in Adjuncts for Sewing-Machine Shuttles, of which the 7 following is'a specification.

This invention relates to a shuttlewhich includes abobbin case, having a post-adapt ed to support andpermit the rotation of a universally wound bobbin.

The object of the invention is to provide an adjunct adapted to be quickly applied to and removed from the bobbin-case post, and

1 to prevent undesirably loose rotation of the bobbin, and undesirably loose endwise movement thereof, so that the delivery of thread by the bobbin will not exceed the call for the thread, and the bobbin is not liable to drop on from the post when the shuttle case is held in position for the bobbin to gravitate from the post. a

The invention is embodied in the improved adjunct hereinafter described and claimed. a

Of the accompanying drawings forming a part of this specification,

Figure 1 is a side view of a'central bobbin shuttle, without the bobbin case.

Figure 2 is a section through the shuttle on the plane line 22 of Figure 1, the bobbin case and bobbin thereon, and an adjunct embodying the invention being shown in section on the same plane. V

Figure 3 is a section on line 33 of Figure 2. r

Figure 4 is a perspective view of my improved adjunct.

The same reference characters indicate 7 tate.

It is customary to employ universally wound bobbins in shuttles of this character, the bobbin including a core 16, which is usually a'tube of paper, and a winding 17 of thread universally wound on the core. The core has a somewhat loose fit on the bobbincase post 14, so that when the case is re- *A'nJnNcr non sEWING-MA HINE sHnTTLns.

. Specification of Letters Patent. Patented 4, Application filedfebruary 28, 1921. Serial ,No. 448,689.,

manipulated and held in various positions,

the bobbin is liable to drop from the post 1 14, the fit of' the, bobbincore on .thejpost' being so" loose, that ,the bobbin is free to move endwise by gravity, when the post is inclined downward from the closed end of the case 15.

In carryingont my inventionl provide a resilientlsplit sleeve: 18, made fromv relatively' thin resilient sheet metal, the thickness of the metal being such thatthe sleeve is adapted to be interposed between the post 14 and the bobbin core 16, without requiring any enlargement of the core to accommodate the sleeve. The edges 18" of the sleeve normally abut against each other, the diameter of the sleeve being such that when it is placed upon the post 14, the sleeve is somewhat expanded, so that its edges are more or less separated, and the sleeve, by reason of its effort tocontract, has a close frictional bearing upon the post 14, the frictional contact of'the sleeve with c the post being such that the sleeve does not rotate with the bobbin, and constitutes an unyielding bearing on which the bobbin core is adapted to rotate.

The sleeve is provided with a resilient tongue 19, formed by cutting the sleeve to form an opening, the tongue being integral with the, sleeve, and joined thereto at one v The tongue is norend of the opening.

mally inclined outward from the periphery of the sleeve, as shown by Figure 4. As indicatedby Figure 3, the tongue is adapted to be pressed inward, into the opening and flush with the periphery of the sleeve, by

19 to assume its normal position shown by- Figure '4, causes the tongue to bear yieldthe bobbin core 16. The eifort of the tongue readily applicable to the post of a bobbin case, the application of the sleeve requiring no modification, either of the'post or the bobbin core, and that when the sleeve is in use, it controls the bobbin and prevents liability of accidental separation thereof from the case. The frictional hold of the sleeve on the bobbin-case post enables it to remain inengagement with the post when the bobbin core is removed, so that the sleeve is always in readiness. to be engaged with the core'voi a fresh bobbin replacing the removed-core of a spent bobbin.-

The sleeve may be formed so that its n a longitudinal slot'in itspostyand a bobbinejecting finger projecting laterally from within the post, through the slot and engaglng the inner end of the bobbin to partially eject the latter from the case. Theejeeting finger of the Porter patent may be projected between the edges 18 of the sleeve 18.

I claim:

A bobbin-controlling adjunct for a bobbin case having a central post; said adjunct comprising a split sleeve of thin resilient material having an'openlng in one slde, and

adapted to fill an annular space between said post and bobbineore; and .afresilient. V tongue joined to the sleeve at one end. of

said opening, normally inclin'ed"outwa'rd trom the sleeve, and adapted to be pressed into said opening, the sleeve being normally of smaller diameter than said post, and

adapted vto be expanded by and 'frictionally hug the latter'to resist movement of the sleeve on .the post; the sleeve; when ex panded bythe post, being adapted-to closely fit theinternal surface of a'bobbin core, and the tongue being adapted to be forced by the core 'into said opening, and tO'eXert'aI yielding outward rotation-resisting pressure on the core. i

In testimony whereof lhave aflixedrny Lucius E; WEA ER} signature; 

